Marvin is important to me. I would really like to hear if any of you have encountered problems with IOS 14?
Positive news are also very welcome.
TIA
I have not tried everything, but it seems to work.
I actually run betas on my backup device to test for Marvin compatibility.

I've been using iPadOS 14 since around July and Marvin works fine. iOS 14 actually fixed a text selection bug I had in dialog boxes with iOS 13 and iPad 7 (unsupported resolution).

Obviously still less than ideal on notched iPhones if using light backgrounds.
Thank you for your replies. I have installed IOS14 on my 9.7 iPad pro, and Marvin seems certainly to be working allright.
That's pretty much what I do. Eventually Marvin will stop working as they change the API's, but so far no problem.
Sad thing is the alternative I was okay with (Hyphen) seems to have been abandoned as well. I've tried MapleRead, KyBook, etc. but I still keep going back to Marvin.
It's basically a niche market that seems to be more of a hobby than a business. The vast majority stick with whatever reading app is associated with the store they use - Kindle, Books or Kobo. After a few years, most developers get bored with it.
Yeah, I know.

Until we go through another transition similar to 32- to 64-bit, I think Marvin should work fine with basic usage (reading books and browsing the library). It's Dropbox support and iCloud syncing that's iffy.

I can easily give up progress syncing but if Dropbox goes, I'll probably end up using Books.
As long as OPDS continues to work then I'll be sticking with Marvin....actually forget that....I'll probably figure out a workaround even then. It would have to be a really good program for it to outperform Marvin!
Progress syncing is a biggie for me, but I don't use dropbox to store ebooks.